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提出了利用数字全息干涉术可视化观测液相扩散过程.实验中,采用马赫-曾德干涉仪光路记录乙醇与水之间两相扩散过程的多幅数字全息图;再通过数值再现不同扩散状态的波前相位分布,获得液体中的摩尔浓度分布;最后,根据菲克定律获得两相流扩散系数.结果表明:利用数字全息干涉术可实现对液相扩散传质过程的快速、实时及高精度测量;该方法还具有可实现远程监控、拥有大量微观数据的优点;此外,采用文中全息干涉光路结合波分与角分复用技术可实现多相流扩散系数的测量,为获得溶液中非线性变化特征参量提供了有效技术手段.
A digital holographic interferometer was used to visualize the liquid-phase diffusion process. In the experiment, the digital hologram of two-phase diffusion between ethanol and water was recorded by Mach-Zehnder interferometer optical path. The phase distribution of the wave front and the distribution of the molar concentration in the liquid were obtained.Finally, the diffusion coefficient of two-phase flow was obtained according to Fick’s law.The results show that the digital holographic interferometry can realize the fast, real-time and high-precision The method also has the advantages of remote monitoring and a large amount of microscopic data. In addition, the measurement of multiphase flow diffusion coefficient can be achieved by using the holographic interferometric optical path combined with wavelength division and angle-division multiplexing. In order to obtain the nonlinearity of the solution Variational parameters provide effective technical means.